You can offer Discount Vouchers as a way to provide an incentive for existing and new Customers to place Orders with you.
Perhaps you want to drive January sales after the high of Christmas by offering 5% off each Order?
You could then promote this via your E-Marketing platform such as MailChimp.
You set the period in which the Discount Voucher is available and also have the option to make the Discount Voucher available to use only once for each Contact.
To add a Discount Voucher, go to Setup > Features in the Back Office
Your Customer Contacts can then add the Voucher when placing Online Orders by entering the Voucher Code in the relevant field on the Order Box on the right hand side of the page.